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Sudoku puzzles disjoint groups (Su Doku)

My database includes 656 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. The cells with the same color must also contain the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

189721 puzzles downloaded.

9       3   10   4   13          
              9 12     15        
1   10     7   15     3   14 12   9
      2   13 6   5       3      
                      8       5
  12   8     13       5 7     4  
              14       11   10 6  
16 2       4       1   13 12 11    
    5 4 10   15       9       2 11
  16 9   5       7              
  11     6 9       2     5   15  
13       11                      
      9       10   12 6   11      
8   16 1   6     14   7     3   4
        9     5 11              
          12   16   9   10       1
Showing puzzle number: 16
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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